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The OrthoFundamentals TRELLIST™ SI Joint Fusion and Stabilization Implant System is intended for fixation of sacroiliac joint disruptions, and intended for sacroiliac joint fusion for conditions including: Sacroiliac joint disruptions Degenerative sacroiliitis To augment immobilization and stabilization of the sacroiliac joint in skeletally mature patients undergoing sacropelvic fixation as part of a lumbar or thoracolumbar fusion and Acute, non-acute, and non-traumatic fractures involving the sacroiliac joint.

The TRELLIS™ SI Joint Fusion System is a multiple component system consisting of sterile single use accessory instruments and sterile individually packaged screws of various lengths and diameters. The screws are designed to compress and stabilize the sacroiliac joint during the fusion process. They are self-tapping and are designed with a porous mid-shaft region to allow bone to grow onto and into its surface. The cannulated screws have axial fenestrations that allow bone through growth and packing with autograft bone or allograft material. The screws are designed to promote bony fusion onto and into the implant through the macro-surface topography which is generated through EBM additive manufacturing. The fenestration geometry harvests autograft during insertion which helps create an environment for bony in-growth and on-growth.